Process for the production of coke from wood-tar.



F. W. LEFELMANN.

PROCESS FOR THE PRODUCTION OF COKE FROM WOODTAR.

APPLICATION FILED OCT. 1, 1912.

1,064,350; Patented June 10,1913.

Wrr'u E5555 JN ENTOR' Q F'WLEFELMANN fToRu Y v. UNITED STATES PATENT OFFICE.

rnrnpnrc'n WILHELM LEFELMANN, ornnn, ERMAN consequence thereof the only use to which I Pnocnss non 'rHE rnonuc'rron or' COKE rnou WOOD-TAR.

Specification of Letters Patent.

Patented June 1913.

Application filed October 1, 1912. Serial No. 723,866.

To all whom it may concern Be it known that I, FRIEDRICH WILHELM LEFELMANN, chemisd'a "subject of the German Emperor, residing at Aue, Westphalia, Germany, haveinvent'ed a new and useful Process for "the Product-ion of Goke from Wood-Tar,in Particular from Tar Made of -Wood'of Deciduous-Trees; and I do hereby; declare the following to be a full, clear, and V exact description of the same.

The present invention, relates to a process for the production of soft and hard cokethe recovery of the byfrom wood tar and products.

The utilization of tar obtained from the 'wood of deciduous trees has hitherto been attended by considerable difficulties and in such tar was put was that as a fuel. It was hitherto impossible tocompletely distil this tar,- as at the commencementof the coking process the wood tar would rise in the distillation chamber and choke the coolers and pipes so that it was impossible to' produce hard coke. v

According to the present invention the tar from deciduous tree wood is utilized in such a manner, that first the lighter distillation products and the heavy oils are removed by ing retort. a

It is-alrea'dy known to prod'uce-cokefrom tar byrendering the tar thinly liquid-by" a fractionated distillation, whereupon the coking process'proper is performed 'sepa rately, the charge being automatically con veyed from the retort in which distillation takes place into. a separate coking-retort.

The volume of'the pitch which remains inthe distilling retort after-fractionateddistillation increases to about the' ifourfold,

when the temperature rises above about 250- centigrade, and this is employedto convey the pitch from the distillation 1nto the cokheatingwithout any previous distillation and then introducing it into a retort heated to white-heat. The'previoi1s heatingof the tar-has the sole object of rendering it more ith the present nvention themam ob-.

'ject isthe removal oithe more'easily volatile components and the heavy oils and then the automatic conveying of thetar into the, coking retort by the utilization of the taneous rising of the By such sion of the process ,it obtained, that the atformed inthe followingmanner in this open fire. The distillation gases will rise actionof this siphon. The -pitch which passesoyer'mto the highly heated retort b 1 tion'gases may for instance be separated by tendance of the plant isconsiderably simphfied, the danger of theta'r boiling 0\ er is greatly reduced-and choking and a danger of explosion are entirely avoided. This is of the greater importance as wood tar, and

in-particular such from the wood of deciduous trees is very difficult to treat owing to 1ts tendency to boil over. Thewood of all deciduous trees may be used, but beech wood is particularly suited for the process.

In the accompanying drawing a plant for carrying out the process. according to the present invention isexemplified in a diagrammatical manner. The process is per plant.

From the tar storage tank 1 the retort a is filled through the supply pipe 2 to a given height with tar and then heated over an to the condenser '4 whence the distillates may be separated in suitable manner into their various components. After the temperature .has risen above 225 centigra'de, the retort 'a is strongly heated so that the pitch contained in it, which has a great tendency to boil over, will pass through the siphon 5, 6 into theretort b which has pre- 'viously been heated 'to a high temperature.

The-branch 5 ofthe siphon 5,'6'projecting into the retort a is preferably. made glidfable so tha t it may be lowered down to the. bottom. of, the retort a. By such means the vessel cmay' be completely emptied by the is there iinmediately exposed'to a temperature-of centigradeand more and will t herefore'be cokedlwithout again foaming. The distillation gases pass into the conj "of '225 centigrade Jon-1y, while the coking;

ing distilled to thepassing over of the easily. i I

process proper takes place only after the greater part of the volatile gases has passed 01f v I claim:

of deciduous trees, consisting in the tar bevoletile distillation products and the heavy oil's, then being heated to a higher temper tare-until the tar x ises by itself from-the distillation Vessel into a closed coking retort said coking retort being previously heated tothe coking te nnpemtui e.v

Intestimony whereof, I have signed my 15.

name to this specificaition in the presenceof two subscribing witnesses.

I H 1",EmEpRIm WiLHELMLEFELMA N. Witnessesi 1 7 .JEAN'GRUND,

CARL:GRUNII). 

